SYST: Period & not defined

What causes this issue?

No provision is made for period &V1&. It is outside of the period
interval as specified by the number of the ordinary and special periods
in fiscal year version &V2&.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Check your entries.
It is possible that there is a program error, if you have not
entered the period yourself. In this case, inform your system
administrator.

Error message extract from SAP system. Copyright SAP SE.